The problem ("Foo bar with this None and None already exists.") only
happens when I use a ModelForm and choose to specify the field details
myself. Here is an example
Models
class Foo(models.Model):
f = models.IntegerField(unique=True)
def __unicode__(self):
return 'Foo with f = %d' % self.f
class Bar(models.Model):
b = models.IntegerField(unique=True)
def __unicode__(self):
return 'Bar with b = %d' % self.b
class FooBar(models.Model):
foo = models.ForeignKey('Foo')
bar = models.ForeignKey('Bar')
class Meta:
unique_together = (('foo','bar'),)
Form
class FooBarForm(forms.ModelForm):
foo = forms.ModelChoiceField(Foo.objects.all())
bar = forms.ModelChoiceField(Bar.objects.all())
class Meta:
model = FooBar
Try to save a combination of foo and bar that already exists and the
error message says "this None and None", comment out the field
overrides and there's no problem. I have had a look at the ModelForm
and the unique_together code but didn't find anything.
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